中文摘要：

目前天顶方向的车载单光路差分吸收光谱（DOAS）系统在解析污染气体柱浓度时,都是以测量得到的斜柱浓度近似代表垂直柱浓度,这在计算通量时会造成一定的误差。结合多轴DOAS思想,研究了车载多光路DOAS技术,即在汽车移动平台上设置了两个不同仰角（90°,30°）的望远镜分别接收天顶散射光,利用DOAS方法解析两个方向的斜柱浓度,并结合大气辐射传输模型计算大气质量因子最终获得垂直柱浓度。相比于目前的天顶方向车载单光路系统,车载多光路DOAS系统具有高灵敏度、低不确定性等优点。利用此系统在淮南某电厂进行了测试实验,得到了电厂区域排放的NO_2准确垂直柱浓度分布信息,并与天顶方向的斜柱浓度分布比较,两者在浓度趋势上具有较好的一致性。

英文摘要：

The mobile diffrential optical absorption spectroscopy（DOAS） instrument uses a telescope to collect zenith scattered light in the UV or visible region and it was used to derive the vertical column density of trace gases above the measurement route.However,the slant column density are retrieved instead of vertical column density recently,which results in emission flux computing error.Combined with the MAX-DOAS,a mobile multi light DOAS system,which set two different elevation angle telescopes（90°,30°） to receive the scattered light respectively in the mobile platform,was deployed.The slant column density in the two different viewing directions were detected,and combined with the air mass factor computing from radiative transfer model, the vertical column density of trace gas was obtained.Comparison of the current mobile single light（zenith direction） DOAS system,the mobile multi light DOAS system have a lot of advantages like high sensitivity, low uncertainty etc.A test experiment was performed in a power plant of Huainan,Anhui using the new technique.The distribution information of NO_2 vertical column density along the route was derived and compared with the slant column density calculating from the zenith direction,a good agreement was found in the column density trends.